面向下一代绿色网络的阵列波导光栅光电混合交换矩阵的扩展性原理研究

Scalable and power-efficient switching node can reduce the power consumption and the cost of the network during the process of network expansion. Among a number of candidates, optical-electro hybrid crossbar switch, consisting of an arrayed waveguide grating (AWG) and the optical-electrical-optical wavelength converter, has exhibited the superiorities in power consumption, switching speed, and compatibility with the electronic buffer technology. However, the scalability of the AWG is severely restricted by the coherent crosstalk, which restricts the application of large-scale AWG-based optical crossbars. To address this issue, based on the idea of modularity, this project intends to proceed from the routing property of the AWGs and propose to build up large-scale passive wavelength routing systems using a collection of small-scale AWGs, such that the restriction on the scalability of AWG-based optical-electro hybrid crossbar switches can be removed. Also, in order to reduce the cost of the switching systems, this project will bulid conflict graph models and investigate the optimization problems of the proposed optical-electro hybrid crossbar switches. At last, utilizing the facilities of the state key laboratory, this project will experimentally verify the feasibility of the proposals, and further improve the design of the AWG-based switching structures based on the testing data, such that scalable and power-efficient AWG-based optical-electro hybrid switching fabrics can be achieved. The results of this project will provide key ideas not only for next-generation green Internet but also for large data center network.

可扩展的低功耗交换节点技术可以降低网络在扩容过程中带来的功耗和成本。在众多候选技术中，阵列波导光栅(AWG)和光电光波长变换器构成的光电混合交换矩阵在功耗、交换速度、与电子缓存技术的兼容性方面具有很强的优势，但AWG扩展性受到AWG带内串扰的严重限制，阻碍了大规模AWG交换矩阵的应用。为此，本项目拟从AWG的路由特性出发，立足于模块化的思想，提出利用小规模的AWG构建大规模无源波长路由系统的方法，从而在低功耗的前提下解决AWG光电混合交换矩阵扩展性的问题；然后建立冲突图模型对可扩展的光电混合交换矩阵进行优化设计，以降低交换系统成本；最后借助依托单位已有的硬件条件对所提结构进行实验验证，并根据实验数据对设计进行完善，以实现功耗低、成本低、可扩展性好的AWG光电混合交换结构，为下一代绿色互联网以及大型数据中心网络提供关键技术。

可扩展的低功耗交换节点技术可以降低网络在扩容过程中带来的功耗和成本。在众多候选技术中，阵列波导光栅(AWG)和光电光波长变换器构成的光电混合交换矩阵在功耗、交换速度、与电子缓存技术的兼容性方面具有很强的优势，但 AWG 扩展性受到 AWG 带内 串扰的严重限制，阻碍了大规模 AWG 交换矩阵的应用。为此，本项目拟从AWG的路由特性出发，立足于模块化的思想，提出利用小规模的 AWG 构建大规模无源波长路由系统的方法，从而在低功耗的前提下解决AWG光电混合交换矩阵扩展性的问题；然后建立冲突图模型对可扩展的光电混合交换矩阵进行优化设计，以降低交换系统成本；最后借助依托单位已有的硬件条件对所提结构进行实验验证，并根据实验数据对设计进行完善，以实现功耗低、成本低、可扩展性好的AWG光电混合交换结构，为下一代绿色互联网以及大型数据中心网络提供关键技术。

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